[X-ray powder diffraction (XRD) in the study of biomaterials used in dentistry. 3]. / La diffrattometria X (XRD) a polveri nello studio di biomateriali utilizzati in odontostomatologia. Nota 3.

This study considers X-ray power diffraction (XRD) applied to the study of mineral-based biomaterials used in odontostomatology. By means of this method the following materials were analysed: reabsorbable Dac Blu, non reabsorbable Dac Blu, non reabsorbable atomized Dac Blu, non reabsorbable fine Dac Blu, reabsorbable Biocoral 450, Calcitite 2040-12, Orthogel, Apagen, BTF 65, Calcitite 4060-2, Osprogel, Bio-oss, Biostite, Osprovit, Merck Hydroxyapatite. These analysis allow the identification of the crystalline phases, the study of the crystallinity and the crystal chemistry of the samples prepared as powder mixtures. This method permits the determination of the physical chemical and crystalline characteristics of these mineral based biomaterials formed by powders or transformable in powders. All of this information is indispensable for the evaluation of the functional biocompatibility of a biomaterial when its reaction in a biological environment is already known. This method has a great number of advantages against the traditional methods, marking with solid phases, it does not destroy the sample, it does not modify the physical or chemical characteristics and gives more information.

[The characterization by Fourier-transform infrared vibration spectroscopy of mineral-based biomaterials commonly used in dentistry. 4]. / Caratterizzazione mediante spettroscopia vibrazionale infrarossa a trasformata di Fourier (FTIR) di alcuni biomateriali a base minerale di uso comune in odontostomatologia. Nota 4.

In this study the following biomaterials were analysed by means of Fourier transform infrared vibrational spectroscopy (FTIR); they are: reabsorbable Dac Blu, non reabsorbable Dac Blu, non reabsorbable atomized Dac Blu, non reabsorbable fine Dac Blu, reabsorbable Biocoral 450, Calcitite 2040-12, Orthogel, Apagen, BTF 65, Calcitite 4060-2 Osprogel, Bio-Oss, Biostite, Osprovit, Merck Hydroxyapatite. The analysis was performed with a Jasco 5300-FTIR. At 64 readings for spectrum with a 2 cm-1 resolution. By means of this method it has been possible to perform a structural study at a molecular level of the commercial products mentioned before. The analysis showed which of the samples examined had lost the apatite OH- group during production. It also allowed the identification of some of the hydroxyapatites examined as carbonate apatites. Finally, it allowed the identification and quantification of the organic substances in the examined products.

[Caries susceptibility and caries resistance in a sample of 8140 military conscripts. The clinico-epidemiological considerations]. / Cariorecettività e carioresistenza in un campione di 8.140 iscritti di leva. Considerazioni clinico-epidemiologiche.

An epidemiological study on the prevalence of dental caries and resistance in a group of 8,140 called-up soldiers. Possible etiopathogenetic factors or factors which might determine the gradual deterioration of oral health were also analysed.

[The Caridex System for removal of dental caries. Clinical trial]. / Sistema Caridex per la rimozione della caries. Sperimentazione clinica.

The Authors show the results of clinical tests of the Caridex system performed on adults between the ages of 15 and 60 years under the treatments of the Hospital's Odontological Division of the Pavia University. On this ground, after considering the advantages and disadvantages that the chemo-mechanical removal offers to the patient, the Authors show the real indications asserting that this system, even if is not able to supplant the traditional methodologies, it can be helpful if mixed with them and, in limited cases, it can completely replace the drill.

[The Caridex system for removal of caries. SEM observations]. / Sistema Caridex per la rimozione della carie. Osservazioni al MES.

The Authors observed at the SEM the surface of the dentine treated with the Caridex system, comparing it with the one of cavities prepared with traditional systems. The use of chemo-mechanical system consents to obtain a more indented and cleaned surface, even if more or less covered by mineralized deposits that can be removed with the use of a detergent for cavities. It results a surface particularly proper to the use of adhesives fillings materials.